Y=x is a linear function. Linear function is a kind of function, and its general form is y=kx+b(k, b is constant, k≠0), where x is independent variable and y is dependent variable. Especially when b=0, y=kx(k is constant, k≠0), and y is called the proportional function of x.
Linear function and its image are the important contents of algebra in junior high school, the cornerstone of analytic geometry in senior high school, and the key contents of senior high school entrance examination.
Extended data:
The analytical formula of linear function is:
Where m is the slope and cannot be 0; X stands for independent variable and b stands for y-axis intercept. M and b are both constants.
Firstly, the resolution function is set, and then the unknown slope in the analytical formula is determined according to the conditions, thus the analytical formula is obtained. This analytical formula is similar to the oblique section formula in linear equations.
References:
Baidu Encyclopedia-Linear Function